#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

class GreaterThen20 {

public:
  bool operator()(int value) {
    return value > 20;
  }
};

void test01() {

  vector<int> v;
  v.push_back(10);
  v.push_back(20);
  v.push_back(30);
  v.push_back(40);
  v.push_back(50);

  vector<int>::iterator position = find_if(v.begin(), v.end(), GreaterThen20());
  if (position != v.end()) {
    cout << "找到大于 20 的数: " << *position << endl;
  } else {
    cout << "未找到" << endl;
  }
}

class MyCompare {

public:
  bool operator()(const int value1, const int value2) {
    return (value1 > value2);
  }

};

void test02() {
  vector<int> v;
  v.push_back(10);
  v.push_back(20);
  v.push_back(30);
  v.push_back(40);
  v.push_back(50);

  sort(v.begin(), v.end(), MyCompare());

  // 匿名函数: lambda 表达式 [](){};
  for_each(v.begin(), v.end(), [](int value) {cout << value << " "; });
}


int main() {

  //test01();

  test02();

  return EXIT_SUCCESS;
}